What do boys wear over Blazers during the winter in schools that insist on Blazers being worn at all times?

Nothing.
Thermals or Underarmour underneath.

"At DCs school, if they remove the tie, and Blazer - then it would be hard to be sure of the school."

It wouldn't be difficult to work out which school the students go to if they are seen in the local market town at 3pm as there is only one school there and it finishes at 2.50.

I've never seen anyone wearing anything on top of a blazer, I would guess that would look and feel uncomfortable.

I'd go for a jumper underneath on cold days and on wet days it depends how long he would be outside for. My children go on a school bus and only have a 1/4 mile walk to the stop, they don't like raincoats or brollies so just run I think

I suggest a jumper under the blazer and a vest under the shirt in cold weather. If it´s raining, an umbrella (or a cagoule...if he will wear one). Also a scarf and a beanie hat, both in plain, dark colours - again, if he will wear them. Don´t spend much money as they will get lost.

In my experience, many secondary students in the U.K. don´t like to wear coats. If your son is in the minority that will, something like a padded gilet, or ski type jacket would probably be best. Make sure it´s named twice and that he knows the severe consequences of losing it; it should go straight in the locker when he arrives at school!

Mine has this this one from VikingKids. He gets cold and they're properly waterproof too (I have a coat from there as well and won't go anywhere without it in winter).

Actually, it is made very clear at the open evening that on accepting a place at the school, we have to sign an agreement that school uniform will be worn correctly, and in full, on the way to and from school.

We are told that the students are representatives of the school and if we don't like it, feel free to apply to a different school. No exceptions are made and they have been known to 'force' students to colour in logo's with a sharpie and even cut buckles and labels etc from shoes.

Teachers parole the side streets after school, often accompanied by CPO's, and take names of students not following the rules or being anti social and letters are sent home.

We are in London.

"as "no logoes" is actually impossible"

Try John Lewis. They have no-logo ones (waterproof with zip in/out lining) in both black and navy up to age 16 (chest 38").

Superdry coat. Maybe. If it's pouring or really cold. Or a plain jumper underneath the blazer but non of my 3 have ever needed one.

Just asked DD (14 but not cool!) and she says people wear coats from November to Feb if it's cold.

School says coat must be black or navy with no logos but they seem to accept Superdry and similar as "no logoes" is actually impossible :)

DS wears a black north face jacket. His school encourage them to take off their ties & leave their blazers at school as they have problems with the boys being mugged. They don't have to wear their blazers much though, only for certain assemblies. In the summer they don't have to wear ties or blazers when it's hot.

At DCs school, if they remove the tie, and Blazer - then it would be hard to be sure of the school. Some Uniforms it might involve more thorough changing (Blouses and Skirts can be very distinctive).

Soupy - lockers make a difference, a Superdry coat would last seconds otherwise! DD2 hasn't worn a coat at all during her first year at secondary. DD1 did for a term, just a New Look coat so nice but not designer, it disappeared within a month (despite name labels) never to be seen again.

DS cycles to school so needs a coat in winter. He has a really cool, nice looking, light down coat. It's very lightweight but because it's filled with down it keeps him warm and he can just roll it up and put it in his backpack. Either that or a down gilet like Northface or something cheaper. TK Maxx has great lightweight, cool looking winter coats and gilets.

They do have a leg to stand on.

Simply that, whilst pupils are in uniform, they can insist it must be worn correctly.

But nothing whatsoever prevents a pupil from changing (completely) out of uniform when off the premises. ('completely' here meaning 'to the point at which the school can no longer be identified' which might mean more than just taking a tie off).

Surprised to see so many DC not wearing coat. My DS1 walks to school , he has to wear coat during cold days and raining days. He has a rain coat with attached fleece, so he can add on the fleece during winter.He would leave his coat and bag in the locker. I think he visits his locker a lot to change books from the locker when he go to different classroom.

I boughte a V neck school jumper for him, but he didn't use it. As it would be too hot once he get into the building.

No, some schools do deal with stuff outside school, but the legal requirement is their responsibility stops at the school gate, apart from a 10 minute dismissal duty. So they don't legally have a leg to stand on as far as uniform outside the school is concerned. I think I'm still correct, I know Gove talked about changing it, but I don't know if he did.

They can ask that school uniform be worn in a certain way outside school hours, but they can't enforce it. Am happy to be corrected, but I'm fairly sure.

No idea what they wear at school but both DSs have happily worn coats (voluntarily! I've never had to force them). Usually Superdry ones but DS1 (16) requested a River Island parker this year.

They have lockers which I think makes a difference.

Orangeanddemons that may be what your school tells you, but my DCs school does deal with bullying outside of school, patrols bus stops etc., and deals with issues such as cyber bullying.

If someone brings shame on the Uniform, which means it both has to be identifiable as a particular school's uniform, as well as missworn, is punishable by detentions etc. as for in school crimes. Bad behaviour outside school is dealt with by assemblies, but may also bring police involvement if necessary.

Of course I'd known few students actually be punished for incorrect wearing of ties or rolled up skirts, outside of school - but they are all informed it could happen when they start (and teachers do take on duties of patrolling bus stops after school).

D's wears a black cagoule over his blazer if it's raining or on winter mornings when it is really cold. He won't wear a proper coat. The cagoule folds into a bag so it doesn't take much space in his rucksack.

DS didn't wear a coat once in his five years of blazer wearing. He did put on a long sleeved thermal under his shirt if it was freezing. And I mean freezing. There is an optional schooljumper which can be worn under blazer but he refused to wear his (even though I'd already bought it).

So save your money op.

No coats here. Even when DS1 had a locker he still didn't. Don't go buying one unless you are sure it will be worn.

But I don't understand. Schools have no legal responsibility for bullying outside school, teachers have no responsibility for dc when they have left the school gate, so how can the school insist on these uniform rules outside school? I think if you pushed it they would have to back down (and I'm a secondary school teacher!)

It may also depend on whether they have lockers at school, ours doesn't so there's nowhere to put a coat anyway. As others have said, DS has the option of a plain V neck under the blazer but he'll never wear anything over the top of it. If it's raining he'll take an umbrella.

At DCs school, they can ask to remove blazers, and do remove them pretty much always for some lessons (eg. Science, DT and Art).
They have an optional jacket which can be worn over the blazer (and used to have a fleece), but few do. Some have a non-regulation hoodie which they were to and from school. They can wear jumpers or cardigans under the blazer (school ones only).

Few actually wear coats/fleeces etc.

But break times are shorter and can be spent inside (in fact are often spent queueing for a snack/lunch).

A nearby school does have breaks in which people play football, and does also have students who wear coats - neither happen at my DCs school.

I think a lot of school uniform rules are ridiculous. At DD's school the students have to keep their blazers on when walking around in the public areas. They are allowed to take them off in classrooms and when eating their lunch. Only in very hot weather are they allowed to leave them in their lockers.

Many work places, mine included, have much more relaxed dress codes so these rules aren't always representative of the real world.